cheapest place to find koni yellows? PLEASE HELP!!

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mazda3 hatch
Looking for a website to find koni yellows (only the struts) the cheapest. I've found them for around $650, but I heard you can get them for $500. PLEASE HELP!
 
AutoAnything has them for $189 each for the front and $140 each for the rears. Total that is $658 and they have 15% off orders > $150 plus free shipping. Out the door you'll be at $560. I ordered my Konis from there a month ago.
 
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